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Employee Benefit Plans (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2016
USD ($)
plan
Jul. 04, 2015
USD ($)
Jul. 02, 2016
USD ($)
plan
Jul. 04, 2015
USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Amount Company expects to contribute to its pension plans     $ 3,700  
Pension Contributions     $ 2,100 $ 2,500
Multiemployer Plans [Abstract]        
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material | plan 2   2  
Number Of Multiemployer Plans Withdrawal Obligation Could Be Material Certified Red Zone | plan 1   1  
Number of Multiemployer Plans, Certified Red Zone | plan 6   6  
Number of Multiemployer Plans, Certified Yellow Zone | plan 1   1  
Number Of Multiemployer Plans, Withdrawal Obligation | plan 2   2  
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan $ 1,900   $ 1,900  
Maximum [Member]        
Multiemployer Plans [Abstract]        
Multiemployer Plan, Contributions To Individual Plan, Percent     5.00%  
Pension Plan, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 685 $ 1,667 $ 1,322 3,345
Interest cost 1,770 2,638 3,515 5,285
Expected return on plan assets (1,890) (3,051) (3,775) (6,116)
Amortization of prior service cost 7 (20) 14 (40)
Amortization of net loss 1,166 1,284 2,334 2,569
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments 0 0 (1,223) 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements (123) 0 (123) 0
Net pension cost $ 1,615 $ 2,518 $ 2,064 $ 5,043